TI-2026-24855 Aliases CVE-2026-32327 GHSA-qfxp-vc85-jg39

Apache Portable Runtime Utility: apr-util XML stack recursion crash

MEDIUM 46CWE-674Published 2026-08-06 · Updated 2026-08-06

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: High · None · High
Fix status: Partial Red Hat: 4 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-674.

Summary

A bug in APR-util version 1.6.3 (and earlier) allows a stack recursion attack against any library consumer which parses XML from untrusted sources and uses the apr_xml_quote_elem() function. Users are recommended to upgrade to version 1.6.4, which fixes this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00458 39th percentileScored 2026-11-07

Fix Partial Red Hat: 4 advisoriesRed Hat: 4 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apache	Apache Portable Runtime Utility	up to 1.6.3	—	No fix listed	CNA

Apache Portable Runtime Utility VendorApache Affected up to 1.6.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:apache:apr-util::::::::	before 1.6.4	Vulnerable	Apache

cpe:2.3:a:apache:apr-util:*:*:*:*:*:*:*:* Versions before 1.6.4 Vulnerable ·Apache

Remediation

Red Hat 4 advisories

RHSA-2026:69113 Released 2026-09-21 · Red Hat rating Moderate
apr-util security update
- Red Hat Enterprise Linux AppStream (v. 8) apr-util-1.6.1-9.el8_10.1, apr-util-bdb-1.6.1-9.el8_10.1, apr-util-devel-1.6.1-9.el8_10.1 +6
RHSA-2026:66392 Released 2026-09-10 · Red Hat rating Moderate
apr-util security update
- Red Hat Enterprise Linux AppStream (v. 10) apr-util-1.6.3-23.el10_2.1, apr-util-devel-1.6.3-23.el10_2.1, apr-util-ldap-1.6.3-23.el10_2.1 +6
RHSA-2026:66341 Released 2026-09-10 · Red Hat rating Moderate
apr-util security update
- Red Hat Enterprise Linux AppStream (v. 9) apr-util-1.6.1-23.el9_8.1, apr-util-bdb-1.6.1-23.el9_8.1, apr-util-devel-1.6.1-23.el9_8.1 +6

Show 1 more Red Hat advisories

RHSA-2026:58474 Released 2026-08-22 · Red Hat rating Moderate
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images apr-util-1.6.5-1.hum1@aarch64, apr-util-1.6.5-1.hum1@src, apr-util-1.6.5-1.hum1@x86_64 +16

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux AppStream (v. 10)	Fixed	RHSA-2026:66392
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2026:69113
Red Hat Enterprise Linux AppStream (v. 9)	Fixed	RHSA-2026:66341
Red Hat Hardened Images	Fixed	RHSA-2026:58474

Timeline

2026-10-02 Threatist record created from CVE-2026-32327
2026-10-03 Alias added: GHSA-qfxp-vc85-jg39

References

Advisory 2

TI-2009-01863 The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util… CVSS 3.1HIGH 7.5
TI-2009-02302 Multiple integer overflows in the Apache Portable Runtime (APR) library and the Apache… CVSS 2.0HIGH 10.0
TI-2026-26488 Apache Portable Runtime Utility: SQL Injection in apr_dbd_oracle CVSS 3.1CRITICAL 9.1
TI-2010-01567 Memory leak in the apr_brigade_split_line function in buckets/apr_brigade.c in the Apache… CVSS 2.0MEDIUM 5.0
TI-2009-01864 Off-by-one error in the apr_brigade_vprintf function in Apache APR-util before 1.3.5 on… CVSS 2.0MEDIUM 6.4
TI-2026-26754 Apache Portable Runtime Utility: Heap buffer overflow in APR memcached client CVSS 3.1HIGH 7.5

See all 10 →

Sources

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